研究了用速凝铸造工艺制造高性能烧结Nd Fe B磁体·同传统的铸锭工艺相比,速凝铸造工艺细化柱状晶,阻止α Fe枝晶相的产生,改善了铸态合金的微观结构·柱状晶宽度基本在5～25μm之间,尺寸较均匀;在制粉过程中容易得到粒度分布...研究了用速凝铸造工艺制造高性能烧结Nd Fe B磁体·同传统的铸锭工艺相比,速凝铸造工艺细化柱状晶,阻止α Fe枝晶相的产生,改善了铸态合金的微观结构·柱状晶宽度基本在5～25μm之间,尺寸较均匀;在制粉过程中容易得到粒度分布较好的磁粉;富Nd相分布较好,所以在较低烧结温度下可得到较高密度的磁体;由于具有细小均匀的微结构,利用速凝铸带工艺烧结出的磁体具有更高的Br,Hci和(BH)max·展开更多
介绍了纳米晶软磁合金Fe M B的磁畸结构、磁性能及其应用。分析了在不同温度退火后磁畴结构的变化。论述了Fe Nb B合金和Fe Zr B合金的磁性能。得出结论:当Fe Nb B合金中的B含量≤9at%时,淬态合金具有非晶+αFe双重结构,且Bs高达1 6T;加...介绍了纳米晶软磁合金Fe M B的磁畸结构、磁性能及其应用。分析了在不同温度退火后磁畴结构的变化。论述了Fe Nb B合金和Fe Zr B合金的磁性能。得出结论:当Fe Nb B合金中的B含量≤9at%时,淬态合金具有非晶+αFe双重结构,且Bs高达1 6T;加入0 1at%的Cu和1at%的P可减小淬态αFe晶粒的大小,且晶化后结构均匀。在760K、退火1h后获得的纳米晶Fe86Zr6B8合金含有60%晶化的αFe相,并且具有高达1 58T的饱和磁感应强度和较低的铁损。展开更多
Ti5553-xFe (x=0.4, 1.2, 2.0, wt.%) alloys have been designed and fabricated through BE (blended element) sintering to investigate the effect of Fe-addition on athermal ω-phase transformation, α-phase evolution and a...Ti5553-xFe (x=0.4, 1.2, 2.0, wt.%) alloys have been designed and fabricated through BE (blended element) sintering to investigate the effect of Fe-addition on athermal ω-phase transformation, α-phase evolution and age hardening behavior. The results show that the formation of athermal ω-phase is fully suppressed in water-quenched specimens when Fe-addition is up to 2 wt.%. The relevant timescales of α formation during initial stages of aging indicate that incubation time increases with Fe-addition. Further aging results in continuous nucleation and growth of α-phase but finer intragranular α lamellae exhibit in Ti5553-2Fe alloy. In addition, the width and extent of grain boundary α-film increase slightly with incremental Fe-addition, especially in furnace cooling condition. Result of Vickers hardness manifests that Fe-addition leads to a strong hardening effect in both solution and aging treatment. The solid solution strengthening is quantitatively estimated by ab initio calculation based on the Labusch?Nabarro model. The evolution of α-precipitate is rationalized by Gibbs free energy. The prominent hardening effect of Ti5553?2Fe alloy is attributed to both large lattice misfit of β-matrix and fine α-precipitate distribution.展开更多
文摘研究了用速凝铸造工艺制造高性能烧结Nd Fe B磁体·同传统的铸锭工艺相比,速凝铸造工艺细化柱状晶,阻止α Fe枝晶相的产生,改善了铸态合金的微观结构·柱状晶宽度基本在5～25μm之间,尺寸较均匀;在制粉过程中容易得到粒度分布较好的磁粉;富Nd相分布较好,所以在较低烧结温度下可得到较高密度的磁体;由于具有细小均匀的微结构,利用速凝铸带工艺烧结出的磁体具有更高的Br,Hci和(BH)max·
文摘介绍了纳米晶软磁合金Fe M B的磁畸结构、磁性能及其应用。分析了在不同温度退火后磁畴结构的变化。论述了Fe Nb B合金和Fe Zr B合金的磁性能。得出结论:当Fe Nb B合金中的B含量≤9at%时,淬态合金具有非晶+αFe双重结构,且Bs高达1 6T;加入0 1at%的Cu和1at%的P可减小淬态αFe晶粒的大小,且晶化后结构均匀。在760K、退火1h后获得的纳米晶Fe86Zr6B8合金含有60%晶化的αFe相,并且具有高达1 58T的饱和磁感应强度和较低的铁损。
基金Projects(51671158,51871176,51621063)supported by the National Natural Science Foundation of ChinaProject(2014CB644003)supported by the National Basic Research Program of China+1 种基金Project(PB2018008)supported by the 111 Project 2.0,ChinaProject(2018JM5098)supported by the Natural Science Basic Research Plan in Shaanxi Province of China
文摘Ti5553-xFe (x=0.4, 1.2, 2.0, wt.%) alloys have been designed and fabricated through BE (blended element) sintering to investigate the effect of Fe-addition on athermal ω-phase transformation, α-phase evolution and age hardening behavior. The results show that the formation of athermal ω-phase is fully suppressed in water-quenched specimens when Fe-addition is up to 2 wt.%. The relevant timescales of α formation during initial stages of aging indicate that incubation time increases with Fe-addition. Further aging results in continuous nucleation and growth of α-phase but finer intragranular α lamellae exhibit in Ti5553-2Fe alloy. In addition, the width and extent of grain boundary α-film increase slightly with incremental Fe-addition, especially in furnace cooling condition. Result of Vickers hardness manifests that Fe-addition leads to a strong hardening effect in both solution and aging treatment. The solid solution strengthening is quantitatively estimated by ab initio calculation based on the Labusch?Nabarro model. The evolution of α-precipitate is rationalized by Gibbs free energy. The prominent hardening effect of Ti5553?2Fe alloy is attributed to both large lattice misfit of β-matrix and fine α-precipitate distribution.
